"Underfordeling er en tavle som forsyner en del av et bygg med elektrisk energi. Tavlen har en stigerforbindelse med hovedfordeling og har kurser og eventuelt automatikk til den anleggsdelen den skal forsyne. I mindre og mellomstore bygg er det vanlig med en underfordeling i hver etasje. Disse underfordelingene plasseres vanligvis rett over hverandre med en kabelsjakt som forbindelse mellom etasjene. I større bygg må en ha flere underfordelinger i hver etasje. "
http://www.elsiden.no/tegning/16/167.htm

"Sub Distribution Boards
Our range of sub distribution boards offers the electrician all installation possibilities, with sturdy wall mounting cabinets for surface mounting, flush, or partly recessed applications."
http://www.abb.com/product/no/9AAC100282.aspx

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Note added at 16 hrs (2010-11-05 12:50:59 GMT)
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Following are examples in connection with Jeffrey's comment:
"Sub-distribution board. These are distribution boards which although similar construction, are larger than a final circuit distribution boards. The boards are installed half way through the mains distribution system, generally at the point where a large distribution cable terminates, and several smaller sub-circuits start."
http://www.pcsconsult.co.uk/reflib/esystems/mainsd.htm

"Power sub distribution board

This is the first of our sub distribution boards serving our first row of cabs. It is replicated top and bottom for A and B power. The cabling on the left has a raised loop to allow for easy metering of power consumption."
http://www.flickr.com/photos/traftery/719799984/

"Our product range comprises LT Electrical Control Panel, Main Switch Board, Power Distribution Board, Lighting Distribution Board, Sub-Distribution Board, Programmable Logic Control Panel, and many more."
http://emcon.tradeindia.com/

... and many more....